CN111235474A - A kind of high corrosion-resistant stainless steel and its manufacturing method - Google Patents

Abstract

The invention belongs to the technical field of metal processing, in particular to a high corrosion-resistant stainless steel and a manufacturing method thereof. C: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5%, P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, Zr: 0.8‑0.9%, Hf: 0.01-0.02% Cu: 0.8-1.2%, the balance is Fe; the outer wall of the stainless steel rod is wrapped with a drying layer; the drying layer is composed of a desiccant; the outer wall of the drying layer is wrapped with a protective layer; the protective layer is The rubber material effectively solves the breeding of bacteria in the pipeline when the liquid is transported, and avoids the breeding of a large number of bacteria in the closed pipeline after long-term use, thereby causing liquid pollution and even causing health hazards to users and other problems, and There is a drying layer on the outside of the stainless steel rod, which can effectively prevent the corrosion of the stainless steel rod by moisture and other substances, and improve the service life. The setting of the protective layer not only further protects the stainless steel rod.

Description

A kind of high corrosion-resistant stainless steel and its manufacturing method

technical field

The invention belongs to the technical field of metal processing, in particular to a high corrosion-resistant stainless steel and a manufacturing method thereof.

Background technique

Stainless steel is the abbreviation of stainless and acid-resistant steel. The steel that is resistant to weak corrosive media such as air, steam, and water or has stainless steel is called stainless steel. The steel grade is called acid-resistant steel. Due to the difference in chemical composition of the two, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical media corrosion, while acid-resistant steel is generally stainless. The word "stainless steel" does not simply refer to a kind of Stainless steel, but means more than one hundred industrial stainless steels, each of which is developed to perform well in its specific application area, the key to success is to first understand the use, and then determine the correct steel grade, and construction There are usually only six steel grades related to structural applications, and they all contain 17 to 22% chromium, and the better grades also contain nickel. The addition of molybdenum can further improve atmospheric corrosion, especially corrosion resistance to chloride-containing atmospheres.

In the prior art, if stainless steel is used in places with high humidity such as sewage pipelines, it is easy to corrode and breed bacteria, and stainless steel production will be coated. Corrosive, stainless steel profiles made of stainless steel are not protective.

In view of this, in order to overcome the above-mentioned technical problems, our company has designed and developed a high corrosion-resistant stainless steel and its manufacturing method to solve the above-mentioned technical problems.

SUMMARY OF THE INVENTION

In order to make up for the deficiencies of the prior art and solve the problem in the prior art, if the rust steel is used in places with high humidity such as sewage pipes, it is easy to corrode and breed bacteria, and the production of stainless steel will be plated, and if it is used in pipes, it is easy to be damaged. The debris is scratched, which leads to the damage of the coating and the loss of corrosion resistance, and the stainless steel profile made of stainless steel has no protection. The invention provides a high corrosion-resistant stainless steel and a manufacturing method thereof.

The technical solution adopted by the present invention to solve the technical problem is: a kind of high corrosion-resistant stainless steel according to the present invention, and this high-corrosion-resistant stainless steel is composed of the following components:

C: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5%, P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, Zr: 0.8-0.9%, Hf: 0.01-0.02% Cu: 0.8-1.2%, the balance is Fe; by adding Zr, Hf and Cu, making the original steel material with high strength, wear resistance and hardness; at the same time, it has a certain antibacterial property, which solves the breeding of bacteria inside the pipeline when the liquid is transported, and avoids the breeding of a large number of bacteria in the closed pipeline after long-term use. , resulting in liquid pollution and even health hazards to users.

A manufacturing method of stainless steel comprises the following steps:

S1: Mix C, N, Si, Mo, V, Ti, Nb, Nb, O, Mn, P, S, Cr, and Ni as required, and add them to Fe using electric furnace EF, argon-oxygen decarburization furnace AOD It is smelted with the vacuum oxygen refining furnace VOD three-step method to obtain molten steel; by adding the raw materials to the electric donkey EF, the argon oxygen decarburization furnace AOD and the vacuum oxygen refining furnace, a higher heating temperature can be achieved, and then a high melting point can be achieved. The raw materials melt quickly and are thoroughly mixed.

S2: The molten steel obtained in S1 is fully stirred, and Zr, Hf and Cu are added at the same time to obtain a continuous casting billet, then the continuous casting billet is hot repaired, and then hot rolled, and then sprayed with industrial alcohol, and then ethanol is used. Spraying is carried out, and a fan is used to blow air at the same time. After completion, continuous annealing is carried out at 1100 ° C. After the annealing is completed, water cooling is used for rapid cooling to obtain stainless steel bars; by stirring the molten steel, the molten steel is further fully mixed. , by adding Zr, Hf and Cu into the molten steel, the continuous casting billet is obtained, and the stainless steel rod obtained by hot rolling and annealing has high strength, wear resistance and hardness, and has certain antibacterial properties; The use of industrial alcohol spray after hot rolling is beneficial to its flammable characteristics and then overheating the billet, which can improve the stress caused by hot rolling; at the same time, spray with ethanol, and cooperate with the fan to promote the rapid cooling of the billet. On the one hand, the production time can be reduced, and on the other hand, due to the use of ethanol, volatilization can be accelerated, the oxidation of the cast slab can be reduced, and the utilization rate of materials can be improved.

S3: Then put the stainless steel rod obtained in S2 into a shot peening machine for shot peening to fully surface harden and decontaminate the interior of the stainless steel rod; through a special shot peening machine, the surface of the stainless steel rod can be effectively treated. Hardening treatment can remove dust, impurities and excess blanks inside the stainless steel rod at the same time; after the shot peening is completed, the stainless steel rod is pickled with mixed acid, and electrolyzed with sulfuric acid aqueous solution; The surface of the stainless steel rod after pickling and pickling can form an oxide film on the surface, which can protect the surface of the steel pipe when it is used.

S4: After cleaning and drying the stainless steel rod after electroplating in S3 with pure water, spray anti-rust oil on the stainless steel rod. , adhere to the desiccant, and then evenly wrap the surface of the stainless steel rod with the desiccant. The use of the desiccant can absorb the moisture in the anti-rust oil on the one hand to ensure that the moisture will not affect the stainless steel rod, and on the other hand, in the process of daily use, it can absorb Moisture in the environment to avoid corrosion of the stainless steel rod and form a dry layer; after that, spray the rubber melt on the surface of the stainless steel rod evenly wrapped with the desiccant, which can effectively ensure that the desiccant adheres to the surface of the stainless steel rod and will not be detached, and also protects the stainless steel The rod is not easy to be corroded; a protective layer is formed, and the stainless steel profile is obtained after cooling and drying.

Preferably, the spraying method of the industrial alcohol adopts the method of spraying for 3s and pausing for 1s; the ethanol concentration is 5%; and the spray pipe is prevented from igniting due to the combustion of the industrial alcohol.

Preferably, the anti-rust oil is made by mixing 50% anti-rust oil and 50% ethanol; the anti-rust oil has high viscosity and poor fluidity, and the spray form is used in conjunction with ethanol in order to ensure the automation of production. , it can dilute the anti-rust oil, make it more fluid and easy to use in the spray device, and the addition of ethanol will not affect its viscosity and can effectively adhere to the desiccant; at the same time, ethanol is easy to volatilize, and it is easy for ethanol to adhere to the surface of the stainless steel rod. Corrosion of stainless steel rods. Because ethanol is volatile, spray melt rubber after wrapping the desiccant, which can effectively use the high temperature of melt rubber to volatilize ethanol. The desiccant is combined with the melt rubber, and the desiccant is better fitted with the stainless steel rod, so that the melt rubber has the characteristics of drying, and due to the heat absorption of ethanol gasification, the inside of the melt rubber can solidify first, weakening its fluidity, which can ensure The uniformity of the melt rubber; at the same time, the vaporization of ethanol will form small holes on the surface of the rubber, and it can also avoid the formation of bulges in the melt rubber during the drying process.

Preferably, the stainless steel rod rotates alternately clockwise and counterclockwise when the rubber is sprayed, and the alternating rotation ensures the uniformity of the protective layer, and the rotational speed is 100 r/min.

Preferably, the stainless steel profile includes a stainless steel rod, a drying layer and a protective layer; the outer wall of the stainless steel rod is wrapped with a drying layer; the drying layer is composed of a desiccant; the outer wall of the drying layer is wrapped with a protective layer; the protective layer It is made of rubber, and the stainless steel rod is provided with a drying layer, which can effectively prevent the corrosion of water and other substances on the stainless steel rod, and improve the service life. The setting of the protective layer not only further protects the stainless steel rod, but also stabilizes the drying layer. Allows stainless steel rods to be used in dirty or wet areas.

The beneficial effects of the present invention are as follows:

1. a kind of high corrosion-resistant stainless steel of the present invention and its manufacture method, this high-corrosion-resistant stainless steel material, increases Zr, Hf and Cu by the raw material that Fe adds, makes the original high strength, wear resistance, corrosion resistance. It also has certain antibacterial properties, which solves the breeding of bacteria inside the pipeline when the liquid is transported, and avoids the breeding of a large number of bacteria in the closed pipeline after long-term use, which will lead to liquid pollution and even cause health problems to users. hazards, etc.

2. A kind of high corrosion-resistant stainless steel according to the present invention and its manufacturing method, the stainless steel bar is provided with a drying layer, which can effectively prevent the corrosion of the stainless steel bar by moisture and other substances, and improve the service life. The rods provide further protection and also stabilize the dry layer, making the stainless steel rods suitable for use in dirty or wet areas.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is the manufacturing method flow chart of stainless steel of the present invention;

Fig. 2 is the perspective view of the stainless steel profile of the present invention;

In the figure: stainless steel rod 1, drying layer 2 and protective layer 3.

Detailed ways

In order to make it easy to understand the technical means, creation features, achieved goals and effects of the present invention, the present invention will be further described below with reference to the specific embodiments.

As shown in Figure 1 to Figure 2, a high corrosion-resistant stainless steel according to the present invention, the high corrosion-resistant stainless steel is composed of the following components:

C: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5%, P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, Zr: 0.8-0.9%, Hf: 0.01-0.02% Cu: 0.8-1.2%, the balance is Fe; by adding Zr, Hf With Cu, the original high-strength, wear-resistant and hardness steel materials have certain antibacterial properties at the same time, which solves the breeding of bacteria inside the pipeline during liquid transportation, and avoids the breeding of a large number of bacteria in the closed pipeline after long-term use. This in turn leads to problems such as liquid contamination and even health hazards to users.

A manufacturing method of stainless steel comprises the following steps:

S1: Mix C, N, Si, Mo, V, Ti, Nb, Nb, O, Mn, P, S, Cr, and Ni as required, and add them to Fe using electric furnace EF, argon-oxygen decarburization furnace AOD It is smelted with the vacuum oxygen refining furnace VOD three-step method to obtain molten steel; by adding the raw materials to the electric donkey EF, the argon oxygen decarburization furnace AOD and the vacuum oxygen refining furnace, a higher heating temperature can be achieved, and then a high melting point can be achieved. The raw materials melt quickly and are thoroughly mixed.

S2: The molten steel obtained in S1 is fully stirred, and Zr, Hf and Cu are added at the same time to obtain a continuous casting billet, then the continuous casting billet is hot repaired, and then hot rolled, and then sprayed with industrial alcohol, and then ethanol is used. Spraying is carried out, and a fan is used to blow air at the same time. After completion, continuous annealing is carried out at 1100 ° C. After the annealing is completed, water cooling is used for rapid cooling to obtain stainless steel rod 1; by stirring the molten steel, the molten steel is further fully promoted. Mixing, by adding Zr, Hf and Cu into the molten steel, the continuous casting billet is obtained, and at the same time, by hot rolling and annealing, the obtained stainless steel rod 1 has high strength, wear resistance and hardness, and has certain antibacterial properties. After hot rolling, industrial alcohol spray is used to facilitate its flammable properties, and then overheating the billet can improve the stress caused by hot rolling; at the same time, ethanol is used for spraying, and the fan can promote the rapid cooling of the billet , on the one hand, it can reduce the production time, on the other hand, due to the use of ethanol, it can speed up volatilization, reduce the oxidation of the casting billet, and improve the utilization rate of materials.

S3: The stainless steel rod 1 obtained in S2 is then placed in a shot blasting machine for shot peening, so as to carry out sufficient surface hardening and decontamination treatment on the interior of the stainless steel rod 1; the special shot blasting machine can effectively treat the stainless steel rod. 1. The surface is hardened, and at the same time, the dust, impurities and excess blanks inside the stainless steel rod 1 can be removed; after the shot peening treatment is completed, the stainless steel rod 1 is pickled with mixed acid, and electrolyzed with an aqueous sulfuric acid solution; After washing, surface treatment is performed again, and at the same time, the surface of the stainless steel rod 1 after pickling can form an oxide film on the surface, which can protect the surface of the steel pipe during use.

S4: After the stainless steel rod 1 after electroplating in S3 is washed and dried with pure water, the anti-rust oil is sprayed on the stainless steel rod 1, on the one hand, it can ensure that the stainless steel rod 1 is not easy to rust and corrosion, and on the other hand, it can be used as an adhesive agent. Use the bonding agent, adhere to the desiccant, and then evenly wrap the surface of the stainless steel rod 1 with the desiccant. Using the desiccant, on the one hand, can absorb the moisture in the anti-rust oil to ensure that the moisture will not affect the stainless steel rod 1, and on the other hand, it is used in daily use. During the process, it can absorb the moisture in the environment, avoid the corrosion of the stainless steel rod 1, and form a drying layer 2; after that, spray the rubber melt on the surface of the stainless steel rod 1 evenly wrapped with the desiccant, which can effectively ensure that the desiccant adheres to the surface of the stainless steel rod 1. It will not be detached, and at the same time, it can protect the stainless steel rod 1 from being easily corroded; a protective layer 3 is formed, and the stainless steel profile is obtained after cooling and drying.

As an embodiment of the present invention, the spraying method of the denatured alcohol adopts the method of spraying for 3 s and pausing for 1 s; the ethanol concentration is 5%; the spray pipe is prevented from igniting due to the burning of denatured alcohol.

As an embodiment of the present invention, the anti-rust oil is made by mixing 50% anti-rust oil and 50% ethanol; the anti-rust oil has high viscosity and poor fluidity, and the spray form is used to ensure automatic production. It can be used in conjunction with ethanol to dilute the anti-rust oil, making it more fluid and easy to use in spray devices. At the same time, the addition of ethanol will not affect its viscosity and can effectively adhere to the desiccant; at the same time, ethanol is easy to volatilize and ethanol It is easy to corrode the stainless steel rod 1 when it is attached to the surface of the stainless steel rod 1. Because ethanol is volatile, spray the melt rubber after wrapping the desiccant, which can effectively use the high temperature of the melt rubber to volatilize the ethanol, and the ethanol needs to pass through when it volatilizes. The drying layer 2 can well combine the desiccant with the melt rubber, and the desiccant fits better with the stainless steel rod 1, so that the melt rubber has the characteristics of drying, and the internal heat of the melt rubber can be made due to the heat absorption of ethanol vaporization. First solidify to weaken its fluidity, which can ensure the uniformity of the melt rubber; at the same time, the gasification of ethanol will form small holes on the rubber surface, and can also avoid the formation of bulges in the melt rubber during the drying process.

As an embodiment of the present invention, the stainless steel rod 1 rotates alternately clockwise and counterclockwise when the rubber is sprayed, and the alternating rotation ensures the uniformity of the protective layer 3, and the rotational speed is 100 r/min.

As an embodiment of the present invention, the stainless steel profile includes a stainless steel bar 1, a drying layer 2 and a protective layer 3; the outer wall of the stainless steel bar 1 is wrapped with a drying layer 2; the drying layer 2 is composed of a desiccant; the The outer wall of the drying layer 2 is wrapped with a protective layer 3; the protective layer 3 is made of rubber. The arrangement not only further protects the stainless steel rod 1, but also stabilizes the drying layer 2, so that the stainless steel rod 1 can be used in sewage or wet areas.

In order to verify the antibacterial effect of the high corrosion-resistant stainless steel prepared by the present invention, and the changes in the number of Escherichia coli in the pipeline during use, and to explore the influence of the changes in the added raw materials of the present invention on the antibacterial effect, the following four experimental groups were made:

Experimental group 1

Take C: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5% , P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, Hf: 0.01-0.02% Cu: 0.8-1.2%, and the balance is Fe and its impurities. Corrosion-resistant stainless steel, simulating the semi-closed condition of the stainless steel rod, adding the highly corrosion-resistant stainless steel to the bottom of the petri dish, then smearing the cultured E. Colony counts were detected and recorded.

Experimental group 2

Take C: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5% , P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, Zr: 0.8-0.9%, Cu: 0.8-1.2%, the balance is Fe and its impurities, and the method is prepared according to the present invention. High corrosion-resistant stainless steel, simulating the semi-closed condition of the stainless steel rod, adding the high-corrosion-resistant stainless steel to the bottom of the petri dish, then smearing the cultured Escherichia coli on the surface of the stainless steel, and detecting the original colony number, after 24h, 48h and 72h, Colony counts were detected and recorded.

Experimental group 3

Take C: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5% , P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, Zr: 0.8-0.9%, Hf: 0.01-0.02% and the balance is Fe and its impurities. Corrosion-resistant stainless steel, simulating the semi-closed condition of the stainless steel rod, adding the highly corrosion-resistant stainless steel to the bottom of the petri dish, then smearing the cultured E. Colony counts were detected and recorded.

Experimental group 4

Take C: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5% , P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, Zr: 0.8-0.9%, Hf: 0.01-0.02%, Cu: 0.8-1.2%, the balance is Fe and its impurities, The high corrosion-resistant stainless steel is prepared according to the method of the present invention, simulating the semi-closed condition of the stainless steel rod, adding the high-corrosion-resistant stainless steel to the bottom of the petri dish, then smearing the cultured Escherichia coli on the surface of the stainless steel, and detecting the original colony number, after 24 hours , 48h and 72h, the number of colonies were detected and recorded.

Experimental group 5

Take C: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5% , P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, the balance is Fe and its impurities, the high corrosion-resistant stainless steel is prepared according to the method of the present invention, the semi-closed condition of the stainless steel rod is simulated, and the petri dish is prepared. The high corrosion-resistant stainless steel was added to the bottom, then the cultured Escherichia coli was smeared on the surface of the stainless steel, and the original colony count was detected. After 24h, 48h and 72h, the colony count was detected and recorded.

Table 1 (comparison of raw materials in experimental group)

Table 1 (Escherichia coli colony count statistics)

Table 2 shows that from experimental groups 1, 2 and 3, it can be seen that when new ingredients are added to the raw materials, the number of Escherichia coli colonies decreases significantly over time; In the case of the same raw material composition, the number of Escherichia coli colonies did not decrease significantly over time. It can be seen from experimental group 5 that, compared with the addition of some new raw materials, the number of Escherichia coli colonies decreased significantly over time; The newly added raw materials of Zr, Hf and Cu of the present invention can obviously inhibit and sterilize the colony count of Escherichia coli.

The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of the present invention. Under the premise of not departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention, and the claimed scope of the present invention is determined by the appended claims and Its equivalents are defined.

Claims (6)

1. A high corrosion-resistant stainless steel is characterized in that: the high corrosion-resistant stainless steel comprises the following components:

c: 0.01%, N: 0.01%, Si: 0.3%, Mo: 5%, V: 0.5%, Ti: 0.1%, Nb: 0.7%, Nb: 0.001%, O: 0.001%, Mn: 0.5%, P: 0.01%, S: 0.01%, Cr: 25%, Ni: 2%, Zr 0.8-0.9%, Hf 0.01-0.02% Cu: 0.8-1.2 percent of Fe and the balance of Fe.

2. A method of manufacturing a stainless steel, which is suitable for use in a high corrosion-resistant stainless steel according to claim 1, comprising the steps of:

s1: c, N, Si, Mo, V, Ti, Nb, O, Mn, P, S, Cr and Ni are proportioned according to requirements, added into Fe and smelted by adopting three-step methods of an electric furnace EF, an argon oxygen decarburization furnace AOD and a vacuum oxygen refining furnace VOD to obtain molten steel;

s2: fully stirring the molten steel obtained in the step S1, simultaneously adding Zr, Hf and Cu to obtain a continuous casting blank, then performing hot repair on the continuous casting blank, then performing hot rolling, firstly spraying industrial alcohol, then spraying ethanol, simultaneously blowing air by using a fan, continuously annealing at 1100 ℃, and after finishing annealing, performing water-cooling rapid cooling to obtain a stainless steel bar (1);

s3: shot blasting is performed on the stainless steel rod (1) obtained in the step S2 in a shot blasting machine to perform sufficient surface hardening and desmearing treatment on the inside of the stainless steel rod (1); after the shot blasting treatment is finished, the stainless steel bar (1) is subjected to acid cleaning by adopting mixed acid, and an oxidation film is electroplated by using a sulfuric acid aqueous solution;

s4: cleaning and drying the stainless steel rod (1) electroplated in the step S3 by pure water, spraying an antirust oil solution on the stainless steel rod (1), and uniformly wrapping a drying agent on the surface of the stainless steel rod (1) to form a drying layer (2); and then spraying rubber melt on the surface of the stainless steel bar (1) uniformly coated with the drying agent to form a protective layer (3), and cooling and drying to obtain the stainless steel section.

3. The method for preparing a stainless steel according to claim 2, wherein: the spraying mode of the industrial alcohol adopts a mode of spraying for 3s and pausing for 1 s; the ethanol concentration is 5%.

4. The method for preparing a stainless steel according to claim 2, wherein: the rust-proof oil agent is formed by mixing 50% of rust-proof oil and 50% of ethanol.

5. The method for preparing a stainless steel according to claim 2, wherein: the stainless steel bars (1) alternately rotate clockwise and anticlockwise when the rubber is sprayed, and the rotating speed is 100 r/min.

6. The method for preparing a stainless steel according to claim 2, wherein: the stainless steel section comprises a stainless steel bar (1), a drying layer (2) and a protective layer (3); the outer wall of the stainless steel rod (1) is wrapped with a drying layer (2); the drying layer (2) consists of a drying agent; the outer wall of the drying layer (2) is wrapped with a protective layer (3); the protective layer (3) is made of rubber.

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